forked from asynkron/protoactor-go
/
endpoint_manager.go
169 lines (143 loc) · 4.45 KB
/
endpoint_manager.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
package remote
import (
"sync"
"sync/atomic"
"github.com/AsynkronIT/protoactor-go/mailbox"
"github.com/AsynkronIT/protoactor-go/actor"
"github.com/AsynkronIT/protoactor-go/eventstream"
)
var endpointManager *endpointManagerValue
type endpointLazy struct {
valueFunc func() *endpoint
unloaded uint32
}
type endpoint struct {
writer *actor.PID
watcher *actor.PID
}
type endpointManagerValue struct {
connections *sync.Map
config *remoteConfig
endpointSupervisor *actor.PID
endpointSub *eventstream.Subscription
}
func startEndpointManager(config *remoteConfig) {
plog.Debug("Started EndpointManager")
props := actor.FromProducer(newEndpointSupervisor).
WithGuardian(actor.RestartingSupervisorStrategy()).
WithSupervisor(actor.RestartingSupervisorStrategy()).
WithDispatcher(mailbox.NewSynchronizedDispatcher(300))
endpointSupervisor, _ := actor.SpawnNamed(props, "EndpointSupervisor")
endpointManager = &endpointManagerValue{
connections: &sync.Map{},
config: config,
endpointSupervisor: endpointSupervisor,
}
endpointManager.endpointSub = eventstream.
Subscribe(endpointManager.endpointEvent).
WithPredicate(func(m interface{}) bool {
switch m.(type) {
case *EndpointTerminatedEvent, *EndpointConnectedEvent:
return true
}
return false
})
}
func stopEndpointManager() {
eventstream.Unsubscribe(endpointManager.endpointSub)
endpointManager.endpointSupervisor.GracefulStop()
endpointManager.endpointSub = nil
endpointManager.connections = nil
plog.Debug("Stopped EndpointManager")
}
func (em *endpointManagerValue) endpointEvent(evn interface{}) {
switch msg := evn.(type) {
case *EndpointTerminatedEvent:
em.removeEndpoint(msg)
case *EndpointConnectedEvent:
endpoint := em.ensureConnected(msg.Address)
endpoint.watcher.Tell(msg)
}
}
func (em *endpointManagerValue) remoteTerminate(msg *remoteTerminate) {
address := msg.Watchee.Address
endpoint := em.ensureConnected(address)
endpoint.watcher.Tell(msg)
}
func (em *endpointManagerValue) remoteWatch(msg *remoteWatch) {
address := msg.Watchee.Address
endpoint := em.ensureConnected(address)
endpoint.watcher.Tell(msg)
}
func (em *endpointManagerValue) remoteUnwatch(msg *remoteUnwatch) {
address := msg.Watchee.Address
endpoint := em.ensureConnected(address)
endpoint.watcher.Tell(msg)
}
func (em *endpointManagerValue) remoteDeliver(msg *remoteDeliver) {
address := msg.target.Address
endpoint := em.ensureConnected(address)
endpoint.writer.Tell(msg)
}
func (em *endpointManagerValue) ensureConnected(address string) *endpoint {
e, ok := em.connections.Load(address)
if !ok {
el := &endpointLazy{}
var once sync.Once
el.valueFunc = func() *endpoint {
once.Do(func() {
rst, _ := em.endpointSupervisor.RequestFuture(address, -1).Result()
ep := rst.(*endpoint)
el.valueFunc = func() *endpoint {
return ep
}
})
return el.valueFunc()
}
e, _ = em.connections.LoadOrStore(address, el)
}
el := e.(*endpointLazy)
return el.valueFunc()
}
func (em *endpointManagerValue) removeEndpoint(msg *EndpointTerminatedEvent) {
v, ok := em.connections.Load(msg.Address)
if ok {
le := v.(*endpointLazy)
if atomic.CompareAndSwapUint32(&le.unloaded, 0, 1) {
em.connections.Delete(msg.Address)
ep := le.valueFunc()
ep.watcher.Tell(msg)
ep.watcher.Stop()
ep.writer.Stop()
}
}
}
type endpointSupervisor struct{}
func newEndpointSupervisor() actor.Actor {
return &endpointSupervisor{}
}
func (state *endpointSupervisor) Receive(ctx actor.Context) {
if address, ok := ctx.Message().(string); ok {
e := &endpoint{
writer: state.spawnEndpointWriter(address, ctx),
watcher: state.spawnEndpointWatcher(address, ctx),
}
ctx.Respond(e)
}
}
func (state *endpointSupervisor) HandleFailure(supervisor actor.Supervisor, child *actor.PID, rs *actor.RestartStatistics, reason interface{}, message interface{}) {
supervisor.RestartChildren(child)
}
func (state *endpointSupervisor) spawnEndpointWriter(address string, ctx actor.Context) *actor.PID {
props := actor.
FromProducer(newEndpointWriter(address, endpointManager.config)).
WithMailbox(newEndpointWriterMailbox(endpointManager.config.endpointWriterBatchSize, endpointManager.config.endpointWriterQueueSize))
pid := ctx.Spawn(props)
return pid
}
func (state *endpointSupervisor) spawnEndpointWatcher(address string, ctx actor.Context) *actor.PID {
props := actor.
FromProducer(newEndpointWatcher(address))
pid := ctx.Spawn(props)
return pid
}